It seems pretty clear that achieving level 81 in FOTM was supposed to be impossible from the lack of AR available alone and it was even patched so that no other future players could do the same for the last few months. The hints were already there.
The use of revive orbs was also not intended as a necessary dungeon mechanic, but a convenient safety net to save a player(s) progress in a close encounter on occasion.
I do believe that the effort was admirable, but does not nor did it ever promise a reward. It was merely a time-wasting challenge that a few players chose to embark on, despite knowing that it carried no potential reward at the end like a legendary weapon, the “dungeon master” title, or finishers/titles in spvp ranks as mentioned in previous examples.
It was a huge time sink that offered no increased drops and demanded the use of revive orbs and a series of exploits that were slowly patched so that players could no longer skip content or be essentially unharmable in many situations (however, some still exist and are used regularly today as well).
Face it, the gamble did not pay off and there was nothing to lose because there was never anything to be gained from super-leveling FOTM. So take it for what it was, a personal PVE challenge done just because it could be done.
*I mean seriously, did these players really expect to have access up to level 81 in FOTM after the difficulty had been completely revamped with instability, new mini dungeons, bosses, and a leaderboard. Just be glad that FOTM has finally been updated because that was the only legitimate complaint made about since it was released.